JP5919781B2 - Smart system - Google Patents

Description

  The present invention relates to a smart system for a vehicle.

  Conventionally, an in-vehicle system mounted on a vehicle intermittently wirelessly transmits a request signal, and when a portable device carried by a user receives the request signal, the portable device wirelessly transmits an answer signal. Based on the reception of the signal, there is a function of performing smart driving (unlocking the vehicle door and / or starting the vehicle driving device). Such a function is called a smart function.

  Since the portable device used for the smart function does not know when the request signal is received from the vehicle, the portable device must be able to receive the request signal constantly or intermittently, which increases the power consumption of the portable device. It was.

  In the past, such smart functions were sometimes stopped. For example, if you want to stop the smart function while using the vehicle, such as when a person who has embedded a weak device such as a pacemaker boarded the vehicle, operate the in-vehicle system and do not send a request signal from the in-vehicle system I was able to. In this case, since the answer signal is not transmitted unless the request signal is transmitted, the smart function is stopped.

JP 2005-256472 A

  However, even if the smart function is stopped as described above, the portable device consumes power to wait for reception of the request signal.

  In view of the above points, the first object of the present invention is to reduce the power consumption of a portable device as compared with the prior art when the smart function is stopped. It is a second object of the present invention to provide a method for restarting after stopping a smart function.

  The invention according to claim 1 for achieving the first object includes an in-vehicle system (10) mounted on a vehicle and a portable device (20) portable by a user, and the in-vehicle system (10). ) Wirelessly transmits the first request signal (111), and the portable device (20) wirelessly transmits the first answer signal (113) based on the reception of the first request signal (111). The in-vehicle system (10) is a smart system that performs one or both of unlocking the door of the vehicle and starting the vehicle driving device based on the reception of the first answer signal (113). The portable device (20) includes a demodulation unit (22) for receiving, amplifying and demodulating a signal transmitted wirelessly, and the demodulation unit (22) receives a signal from the in-vehicle system (10). A normal power consumption mode that can be received and a low power consumption mode in which the demodulator (22) cannot receive a signal and that consumes less power than the normal power consumption mode are alternately repeated, and the portable device (20 ), Based on the fact that a predetermined cancel operation has been performed on the smart system, to stop repeating the normal power consumption mode and the low power consumption mode and maintain the low power consumption mode. It is a smart system featuring.

  As described above, based on a predetermined cancel operation performed on the smart system, the alternate repetition between the normal power consumption mode and the low power consumption mode is stopped and the low power consumption mode is maintained. In this way, when the smart function is stopped, the alternate repetition of the normal power consumption mode and the low power consumption mode can be stopped, so that the power consumption of the portable device is reduced as compared with the conventional case. be able to.

Further, an invention according to claim 1, a vehicle system mounted on a vehicle (10), a user and a portable mobile device (20), said vehicle system (10) a first request signal ( 111) wirelessly transmitted, the portable device (20) wirelessly transmits a first answer signal (113) based on the reception of the first request signal (111), and the in-vehicle system (10) A smart system that performs one or both of unlocking the door of the vehicle and starting the vehicle driving device based on receiving the first answer signal (113), the portable device (20 ) Has a demodulator (22) for receiving, amplifying and demodulating a wirelessly transmitted signal, and the demodulator (22) can receive a signal from the in-vehicle system (10). Mode and the low power consumption mode in which the demodulation unit (22) cannot receive a signal and consumes less power than the normal power consumption mode are alternately repeated, and the in-vehicle system (10) Based on the cancellation operation (117) being performed on the in-vehicle system (10), a smart function stop signal (123) is transmitted to the portable device (20), and the portable device (20) On the basis of the reception of the function stop signal (123), the repetition of the normal power consumption mode and the low power consumption mode is stopped and the low power consumption mode is maintained.

  As described above, the smart function stop signal (123) is transmitted from the in-vehicle system (10) to the portable device (20) based on a predetermined cancel operation performed on the in-vehicle system (10), and the portable device (20) stops alternating repetition of the normal power consumption mode and the low power consumption mode based on the reception of the smart function stop signal (123), and maintains the low power consumption mode. In this way, when the smart function is stopped, the alternate repetition of the normal power consumption mode and the low power consumption mode can be stopped, so that the power consumption of the portable device is reduced as compared with the conventional case. be able to.

The invention according to claim 1, wherein the vehicle system (10), the predetermined cancel operation (117) is based on the fact that have been made to vehicle system (10), a second request signal ( 119) to the portable device (20), and the portable device (20) wirelessly transmits the second answer signal (121) based on the reception of the second request signal (119), and The in-vehicle system (10) transmits the smart function stop signal (123) to the portable device (20) based on the reception of the second answer signal (121).

  As described above, the in-vehicle system (10) transmits the second request signal (119) wirelessly, and receives the second answer signal (121) corresponding to the second request signal. Since the function stop signal (123) is transmitted to the portable device (20), the smart function stop signal (123) may be transmitted in a situation where the portable device (20) is reliably within the communication range of the in-vehicle system (10). it can.

The invention according to claim 2 is the smart system according to claim 1 , wherein the in-vehicle system (10) stops the smart function based on the reception of the second answer signal (121). A signal (123) is transmitted to the portable device (20), and then the mode is changed to a low power consumption mode in which the signal cannot be wirelessly transmitted .

  As a result, the in-vehicle system (10) transmits the smart function stop signal (123) and transmits the signal even though the portable device (20) is not within the communication range of the in-vehicle system (10). It is possible to prevent a transition to a low power consumption mode where wireless transmission is not possible.

The invention according to claim 3 for achieving the second object includes an in-vehicle system (10) mounted on a vehicle and a portable device (20) portable by a user, wherein the in-vehicle system is provided. (10) wirelessly transmits the first request signal (111), and the portable device (20) wirelessly transmits the first answer signal (113) based on the reception of the first request signal (111). And, based on the reception of the first answer signal (113), the in-vehicle system (10) is a smart device that performs one or both of unlocking the door of the vehicle and starting the vehicle driving device. The portable device (20) includes a demodulation unit (22) for receiving, amplifying and demodulating a wirelessly transmitted signal, and whether the demodulation unit (22) is an in-vehicle system (10). The normal power consumption mode in which a signal can be received and the low power consumption mode in which the demodulator (22) cannot receive a signal and consumes less power than the normal power consumption mode are alternately repeated, and the smart Based on the fact that a predetermined cancel operation has been performed on the system, the repetition of the normal power consumption mode and the low power consumption mode is stopped to maintain the low power consumption mode, and the portable device (20) When the portable device (20) maintains the low power consumption mode, the portable device (20) is operated based on a predetermined first cancel cancellation operation (411) performed on the portable device (20). A smart system characterized by resuming alternating repetition of the normal power consumption mode and the low power consumption mode.

  Thus, based on the predetermined first cancel cancellation operation (411) being performed on the portable device (20), the portable device (20) alternately repeats the normal power consumption mode and the low power consumption mode. By resuming, wireless signal reception by the portable device (20) becomes possible.

According to a third aspect of the present invention , when the portable device (20) maintains the low power consumption mode, the first cancellation cancellation operation (411) is performed on the portable device (20). The portable device (20) enables the demodulator (22) to receive a signal based on the fact that the in-vehicle system (10) Based on the second cancel cancel operation (409) being performed, a cancel cancel signal (415) is wirelessly transmitted. In the portable device (20), the demodulator (22) transmits the cancel cancel signal (415). ) Is resumed, the alternating repetition of the normal power consumption mode and the low power consumption mode is resumed.

  As described above, when a predetermined first cancel cancellation operation (411) is performed on the portable device (20), first, the demodulation unit (22) can receive the signal, and the in-vehicle system (10) On the other hand, based on the fact that the predetermined second cancel cancellation operation (409) is performed and the cancel cancellation signal (415) wirelessly transmitted from the in-vehicle system (10) is received, the normal power consumption mode and the low power consumption mode By restarting the alternating repetition, it is possible to prevent the portable device (20) from returning to the alternating repetition of the normal power consumption mode and the low power consumption mode unless the in-vehicle system (10) is operated. 20) to prevent the alternate repetition of the normal power consumption mode and the low power consumption mode from being resumed only by performing the first cancel cancellation operation (409). That.

According to a third aspect of the present invention , when the portable device (20) maintains the low power consumption mode, the first cancellation cancellation operation (411) is performed on the portable device (20). The portable device (20) enables the demodulation unit (22) to receive a signal and wirelessly transmits a signal (413) corresponding to the first cancel cancellation operation. Then, after the second cancel cancellation operation (409) is performed on the in-vehicle system (10), the in-vehicle system (10) receives the signal corresponding to the first cancel cancellation operation (409). Based on the reception of (413), the cancel cancellation signal (415) is wirelessly transmitted, and the portable device (20) performs the first cancel cancellation operation (411) on the portable device (20). Is done Based on the fact that the demodulator (22) receives the cancel cancellation signal (415) before a predetermined time (D4) elapses from time to time, the alternating repetition of the normal power consumption mode and the low power consumption mode is resumed. It is characterized by doing.

  As described above, the normal consumption is performed on the condition that the cancellation cancellation signal (415) is received within the predetermined time (D4) after the first cancellation cancellation operation (411) is performed on the portable device (20). By restarting the alternating repetition of the power mode and the low power consumption mode, a signal that arrives at the cancel cancellation signal is received from another device different from the in-vehicle system (10). The possibility of resuming alternating repetition of the low power consumption mode is reduced.

  In addition, the code | symbol in the bracket | parenthesis in the said and the claim shows the correspondence of the term described in the claim, and the concrete thing etc. which illustrate the said term described in embodiment mentioned later. .

It is a block diagram of the smart system which concerns on embodiment of this invention. It is a figure which shows the time-dependent change of the power consumption of each part of a portable machine. It is a sequence diagram which shows exchange of the signal between a vehicle-mounted system and a portable device. It is a flowchart of the process which smart ECU performs. It is a flowchart of the process which a portable side control part performs. It is a sequence diagram which shows exchange of the signal between a vehicle-mounted system and a portable device. It is a figure which shows the time-dependent change of the power consumption of each part of a portable machine. It is a flowchart of the process which smart ECU performs. It is a flowchart of the process which a portable side control part performs.

  Hereinafter, an embodiment of the present invention will be described. FIG. 1 shows a configuration of a smart system according to the present embodiment. This smart system unlocks a vehicle door and starts a vehicle drive device (for example, an engine or an electric motor) as a smart drive, and includes an in-vehicle system 10 mounted on the vehicle and a portable device carried by the user. 20.

  The in-vehicle system 10 includes a smart ECU 1, an LF transmission antenna unit 2, an LF modulation unit 3, an RF reception antenna 4, an RF demodulation unit 5, a sensor 6, an actuator 7, and an operation unit 8.

  The LF modulation unit 3 is a circuit that modulates a signal output from the smart ECU 1 into a request signal in the LF wave band and outputs the request signal to the LF transmission antenna unit 2. As the modulation method, for example, an ASK (Amplitude Shift Keying) modulation method or the like is adopted.

  The RF receiving antenna 4 is an antenna for wirelessly receiving an RF waveband signal (RF radio wave). The RF demodulator 5 is a circuit that demodulates an RF waveband signal received by the RF receiving antenna 4 and outputs the demodulated signal to the smart ECU 1.

  The sensor 6 is a sensor that is attached to a door handle portion or the like of the door of the vehicle, detects a user's operation of placing a hand on the door, and outputs a detection result to the smart ECU 1, and can be realized as a touch sensor, for example. is there.

  The actuator 7 is an actuator that is a target of smart drive, and includes a starter motor of a vehicle engine (or an engine ECU that controls the starter motor), a door lock mechanism that locks and unlocks the door of the vehicle (controls the door lock mechanism). Door ECU).

  The operation unit 8 is a member that can be operated by the user of the vehicle, and outputs a signal corresponding to the operated content to the smart ECU 1.

  The smart ECU 1 is an electronic control unit that performs smart driving based on communication with the portable device 20 by exchanging signals with the LF modulation unit 3, the RF demodulation unit 5, the sensor 6, and the actuator 7.

  The smart ECU 1 is realized as a microcomputer including a CPU, RAM, ROM, I / O, and the like, and the CPU executes programs recorded in the ROM, thereby realizing various processes using the RAM as a work area. To do. Below, the process which CPU performs is described as a process of smart ECU1.

  The smart ECU 1 is supplied with electric power through an electric power supply line 30 connected to the vehicle battery. Specifically, the power supply line 30 and the input line 32 are connected via the fuse 31, and the power supply line 33 and the input line 34 are connected via the fuse 32. The ECU 1 receives power supply.

  The portable device 20 includes an LF reception antenna 21, an LF demodulation unit 22, an LF reception power measurement unit 23, an RF transmission antenna 24, an RF modulation unit 25, and a portable side control unit 26.

  The LF reception antenna 21 is an antenna for receiving an LF waveband signal transmitted from the in-vehicle system 10. The LF demodulator 22 is a circuit that demodulates an LF waveband signal received by the LF receiving antenna 21 and outputs the demodulated signal to the portable-side controller 26. As a demodulation method, for example, an ASK demodulation method is adopted. The LF demodulator 22 has a local oscillator in the LF wave band used for demodulation.

  The operation unit 23 is a member that can be operated by the user of the portable device 20, and includes a lock button 23a and an unlock button 23b. When each of the lock button 23a and the unlock button 23b is pressed, a signal corresponding to the pressed button is input to the smart ECU 1.

  The lock button 23a and the unlock button 23b are for locking and unlocking the door of the vehicle, respectively. That is, the portable side control unit 26 of the portable device 20 controls the RF modulation unit 25 to wirelessly transmit the lock signal to the in-vehicle system 10 based on the depression of the lock button 23a, and the smart ECU 1 of the in-vehicle system 10 Controls the actuator 7 based on the reception of the lock signal via the RF demodulator 5 to lock the vehicle door. Further, the portable side control unit 26 of the portable device 20 controls the RF modulation unit 25 to wirelessly transmit an unlock signal to the in-vehicle system 10 based on the depression of the unlock button 23b, and the in-vehicle system 10 Based on the reception of the unlock signal via the RF demodulator 5, the smart ECU 1 controls the actuator 7 to unlock the vehicle door.

  The RF transmission antenna 24 is an antenna for wirelessly transmitting an RF waveband signal (RF radio wave). The RF modulation unit 25 is a circuit that modulates a data signal output from the portable control unit 26 into an RF waveband signal and outputs the signal to the RF transmission antenna 24. In addition, the RF modulation unit 25 has a local oscillator of an RF wave band used for demodulation.

  The portable side control unit 26 is realized as a microcomputer including a CPU, a RAM, a ROM, an I / O, and the like. When the CPU executes a program recorded in the ROM, various processes are performed using the RAM as a work area. Is realized. Hereinafter, processing executed by the CPU will be described as processing of the portable control unit 26.

  Hereinafter, an example of the operation of the smart system having such a configuration will be described. FIG. 2 is a diagram illustrating changes over time in power usage in the portable side control unit 26, the LF demodulation unit 22, and the RF modulation unit 25 of the portable device 20 in the present example. FIG. 3 illustrates the in-vehicle system 10 and the portable unit in the present example. 4 is a sequence diagram illustrating an operation procedure of the machine 20, FIG. 4 is a flowchart of processing executed by the smart ECU 1 at a normal time, and FIG. 5 is a flowchart executed by the portable control unit 26 at a normal time.

  In this case, the user enters from the outside of the communicable range of the in-vehicle system 10 (for example, within a few meters from the vehicle) while carrying the portable device 20.

  The smart ECU 1 waits until the transmission timing comes in step 205 of FIG. As the transmission timing, there are a polling timing that visits regularly (for example, every 1 second), and a timing when the sensor 6 detects an operation in which the user touches the door.

  When the transmission timing comes, the process proceeds to step 210, and it is determined whether or not a predetermined cancel operation has been performed on the operation unit 8 in the previous step 210. In this example, since the cancel operation has not been performed, it is determined that the cancel operation has not been performed, and the process proceeds to step 215.

  In step 215, processing for transmitting a request signal is performed. Specifically, predetermined request data is output to the LF modulation unit 3. As a result, the LF modulation unit 3 modulates the request data, and transmits the request signal, which is a LF waveband signal as a result of the modulation, using the LF transmission antenna 2.

  Then, the process proceeds to step 220 and waits for reception of an answer signal. Specifically, it waits until predetermined answer data is acquired from the RF demodulator 5. If no answer signal is received after waiting for a reference time (for example, 10 milliseconds), the process returns to step 205.

  On the other hand, in the portable device 20, the portable control unit 26 waits for reception of a request signal in step 305. Specifically, it waits until predetermined request data is acquired from the LF demodulator 22.

  In this case, since the portable device 20 is initially out of the communication range of the in-vehicle system 10, the portable device 20 cannot receive the request signal. In this case, the portable-side control unit 26 waits for reception of a request signal in step 305, and during that time, the portable device 20 repeats the low power consumption mode and the normal power consumption mode.

  Specifically, as shown in FIG. 2, the portable control unit 26 is in the low power consumption mode from time t0 to time t1, transitions to the normal power consumption mode at time t1, and receives a request signal after the transition. If not, transition to the low power consumption mode is performed at time t2 when a predetermined time D1 (for example, 30 milliseconds) elapses from time t1. Then, when a predetermined time D2 (for example, 70 milliseconds) elapses from time t2 and transitions to the normal power consumption mode at time t3 and no request signal is received after the transition, low power consumption at time t4 after elapse of the predetermined time D1 from time t3 Transition to power mode. Then, the transition to the normal power consumption mode is made at time t5 when a predetermined time D2 (for example, 70 milliseconds) elapses from time t4.

  Note that, when the low power consumption mode and the normal power consumption mode are compared, the power consumption of the portable control unit 26 is smaller in the former. This is realized, for example, by lowering the operation clock frequency in the low power consumption mode compared to the normal power consumption mode.

  Further, when the low power consumption mode and the normal power consumption mode are compared, the power consumption of the LF demodulator 22 is smaller in the former. For example, in the low power consumption mode, the portable control unit 26 stops supplying power to one or both of the amplifier circuit and the local oscillator included in the LF demodulator 22, and the amplifier circuit and the local oscillator in the normal power consumption mode. This is realized by allowing the portable control unit 26 to supply power to the mobile phone. Therefore, the LF demodulator 22 cannot receive a radio signal in the low power consumption mode, and can receive a radio signal in the normal power consumption mode. Note that power supply is permitted by the portable control unit 26 only when wireless transmission is performed for the amplification circuit and the local oscillator of the RF demodulation unit 5.

  If the portable device 20 is outside the communication range of the in-vehicle system 10, the smart ECU 1 does not receive an answer signal within the reference time in step 220, so the process returns to step 205 and waits for the next transmission timing.

  Thereafter, when the portable device 20 enters the communication range of the in-vehicle system 10 and the next transmission timing comes in the smart ECU 1, the smart ECU 1 proceeds to step 210 and determines whether there is a cancel operation. In this example, since the cancel operation is not performed here, it is determined that there is no can sail operation, the process proceeds to step 215, and the process for transmitting the request signal 111 (see FIG. 3) is performed as already described.

  At this time, it is assumed that the portable control unit 26 of the portable device 20 is in a request signal waiting state in step 305 and is in the normal power consumption mode. Specifically, it is assumed that the state is at a time point t6 before the predetermined time D1 has elapsed from the time point t5 in FIG.

  Accordingly, the request signal 111 transmitted from the in-vehicle system 10 is received by the portable device 20 within the communication range. Specifically, the LF demodulator 22 receives and demodulates the request signal 111 via the LF reception antenna 21, and outputs the request data obtained as a result of the demodulation to the portable control unit 26. Thereby, the portable side control part 26 acquires request data.

  The mobile-side control unit 26 that has acquired the request data determines that the request signal has been received, and then proceeds to step 310 to perform processing for answer signal transmission. Specifically, predetermined answer data is created, and at time t7 when the creation is completed, the answer data is output to the portable control unit 26. At that time, the portable side control unit 26 operates the RF modulation unit 25. As a result, the RF modulation unit 25 modulates the answer data into an RF wave band answer signal, and wirelessly transmits the answer signal 113 using the RF transmission antenna 24.

  At the time t8 when the wireless transmission is finished, the portable control unit 26 advances the process to step 315 and waits until the portable device 20 receives the smart function stop signal. Specifically, it waits until predetermined smart function stop data is acquired. However, when the standby has continued for a reference time (for example, 10 milliseconds), the process returns to step 305 and shifts to the low power consumption mode.

  On the other hand, in the in-vehicle system 10, the RF demodulator 5 receives and demodulates the answer signal 113 transmitted from the portable device 20, and outputs the answer data obtained as a result of the demodulation to the smart ECU 1.

  Then, the smart ECU 1 proceeds from step 220 to step 255 and starts smart driving (see step 115 in FIG. 3). More specifically, the door is unlocked by controlling the actuator 7, and the engine is started based on the engine start operation (for example, pressing of the engine start button) by the user. After step 220, processing returns to step 205.

  As described above, in this example, since the in-vehicle system 10 does not transmit the smart function stop signal after receiving the answer signal, the portable side control unit 26 waits for a reference time (for example, 10 milliseconds) in step 315. At subsequent time t9, the process returns to step 305 and transitions to the low power consumption mode. As described above, in step 305, the low power consumption mode and the normal power consumption mode are automatically switched alternately (that is, without receiving a user operation).

  Thus, in the smart system, when the portable device 20 enters the communication range of the in-vehicle system 10, the request signal 111 is wirelessly transmitted from the in-vehicle system 10 to the portable device 20, and the portable device 20 receives the request signal 111. Based on this, the answer signal 113 is transmitted wirelessly, and the in-vehicle system 10 realizes smart driving based on the reception of the answer signal 113 (step 115).

  Thereafter, in this example, it is assumed that the user carrying the portable device 20 opens the door unlocked by smart driving and enters the vehicle. Further, it is assumed that the user performs a predetermined cancel operation 117 (see FIG. 3) on the operation unit 8 in the vehicle. The reason for performing the cancel operation is that, for example, when a person who has embedded a weak device such as a pacemaker boarded the vehicle wants to stop the smart function while using the vehicle.

  After that, the smart ECU 1 determines that the transmission timing has arrived in step 205 and then proceeds to step 210, determines that a predetermined cancel operation has been performed after the previous execution time of step 210, and proceeds to step 230. Proceed.

  In step 230, similar to step 215, processing for transmitting a request signal is executed. As a result, the request signal 119 is wirelessly transmitted from the LF transmission antenna 2 of the in-vehicle system 10. The content of this request signal is the same as that of the request signal 111. Subsequently, the process proceeds to step 235, and the reception of an answer signal is awaited by the same process as step 220.

Once this way the request signal 119 is transmitted to the mobile-side control unit 26 over time D2 from the time t9 is the time after entering the normal power consumption mode. Therefore, the request signal 119 transmitted from the in-vehicle system 10 is received by the portable device 20 within the communication range and demodulated by the LF demodulator 22, and is input to the portable controller 26 as request data. Thereby, the portable side control part 26 acquires request data.

The mobile-side control unit 26 that has acquired the request data determines that the request signal has been received in step 305, and then proceeds to step 310 to perform processing for answer signal transmission as already described. This ensures R F modulator 25 starts operating, the answer signal of RF wave band by modulating the answer data outputted from the portable device side control unit 26, the answer signal 121 using an RF transmission antenna 24 Wireless transmission. The content of the answer signal 121 is the same as that of the answer signal 113.

Oite point when the radio transmission is completed, the mobile-side control unit 26 advances the process to step 315, as already described, and waits for reception of smart stall signal the portable unit 20 is. Specifically, it waits until predetermined smart function stop data is acquired.

  On the other hand, in the in-vehicle system 10, the RF demodulator 5 receives and demodulates the answer signal 121 transmitted from the portable device 20, and outputs the answer data obtained as a result of the demodulation to the smart ECU 1.

  Then, the smart ECU 1 proceeds from step 235 to step 240, and performs processing for transmitting a smart function stop signal. Specifically, predetermined smart function stop data (different from request data) is output to the LF modulation unit 3. The smart function stop data includes the ID code of the in-vehicle system 10. As the ID code, one recorded in a storage medium (for example, ROM) of the in-vehicle system 10 is used. As a result, the LF modulation unit 3 modulates the smart function stop data, and transmits the smart function stop signal 123, which is the LF waveband signal as a result of the modulation, using the LF transmission antenna 2.

  Then, in the portable device 20, the smart function stop signal 123 is received by the LF reception antenna 21, the LF demodulation unit 22 demodulates, and the smart function stop data as a demodulation result is output to the mobile side control unit 26. Then, the portable side control unit 26 determines that the portable device 20 has received the smart function stop signal in Step 315, and advances the process to Step 320.

  In step 320, it is determined whether or not the received smart function stop signal is from a legitimate partner (in-vehicle system 10). Specifically, it is determined whether or not the ID code included in the smart function stop data is the same as the comparison ID code. As the comparison ID code, a code recorded in a storage medium (for example, ROM) of the portable control unit 26 is used. As for the comparison ID code, the same data as the ID code recorded in the storage medium of the smart ECU 1 is recorded in advance in the storage medium of the portable control unit 26 as a comparison ID code.

  In this case, since the ID code in the smart function stop signal 123 transmitted from the in-vehicle system 10 is the same as the ID code for comparison, the received smart function stop signal is from an authorized partner (in-vehicle system 10). It is determined that there is, and the process proceeds to Step 325.

In step 325, the mode is changed to the low power consumption mode, and the processing of FIG. As a result , the mode is changed to the low power consumption mode (see step 127 in FIG. 3), and thereafter, the portable device 20 maintains the low power consumption mode until there is a cancellation cancellation described later.

  In the low power consumption mode, as already described, the power consumption of the portable control unit 26 is lower than that in the normal power consumption mode, and the LF demodulator 22 does not supply power to the amplifier circuit and the local oscillator. , Power consumption is reduced, and wireless signals cannot be received. In this way, when the smart function is stopped, the power consumption of the portable device 20 can be reduced as compared with the conventional case.

  Even in the smart ECU 1, after transmitting the smart function stop signal in step 240, in step 245, the normal power consumption mode is entered into the low power consumption mode (see step 125 in FIG. 3), and the processing in FIG. 4 ends. . In the low power consumption mode, the power consumption of the smart ECU 1 is lower than that in the normal power consumption mode. In the smart ECU 1, the amplifier circuit and the local oscillator of the RF demodulator 5 prohibit power supply. As a result, the RF demodulator 5 cannot wirelessly transmit signals (request signal, smart function stop signal, etc.). However, since the amplifier circuit and local oscillator of the LF modulation unit 3 are supplied with power, the LF modulation unit 3 can receive and demodulate radio signals.

  Unlike the present example, when the portable device 20 receives a smart function stop signal from a communication device other than the in-vehicle system 10, in step 320, the ID code in the received smart function stop signal is the same as the comparison ID code. Otherwise, the process returns to step 305, bypassing step 325. As a result, even if a smart function stop signal is received from an in-vehicle system (an in-vehicle system other than the in-vehicle system 10) that is not a legitimate partner, the portable device 20 enters the low power consumption mode by mistake. Disappears.

  Return to this case. It is assumed that the in-vehicle system 10 and the portable device 20 that are in the low power consumption mode have returned to the normal power consumption mode by the cancel operation 117 as described above.

  FIG. 6 shows a sequence diagram showing the operating procedure of the in-vehicle system 10 and the portable device 20 after this situation. FIG. 7 shows the portable side control unit 26, LF demodulator 22, RF modulation of the portable device 20 after this situation. FIG. 8 is a flowchart of processing executed by the smart ECU 1, and FIG. 9 is a flowchart of processing executed by the mobile-side control unit 26.

  First, the smart ECU 1 waits until the in-vehicle system 10 receives an unlock signal in step 250 in the process of FIG. Specifically, it waits until it is obtained from the unlock data RF demodulator 5. In addition, in the process of FIG. 9, the portable side control unit 26 stands by until a predetermined unlock operation is performed in step 350.

  In this state, at time t16 (see FIG. 7), in order for the user of the portable device 20 to enter the vehicle, a predetermined unlock operation 401 (specifically, pressing of the unlock button 23b) is performed on the operation unit 23. I do. Then, the portable control unit 26 determines in step 350 that a predetermined unlock operation has been performed, proceeds to step 355, and performs an activation process. Specifically, the operation clock frequency of the portable control unit 26 is set to be the same as the operation clock frequency in the normal power consumption mode, the power supply to the amplifier circuit and the local oscillator of the LF demodulation unit 22 is permitted, and the RF modulation unit 25 The power supply to the amplifier circuit and the local oscillator is permitted. Thereby, the LF demodulator 22 can receive a radio signal, and the RF modulator 25 can transmit a radio signal.

  Subsequently, in step 360, processing for transmitting the unlock signal is executed. Specifically, predetermined unlock data is created, and the created unlock data is output to the RF modulation unit 25. As a result, the RF modulation unit 25 modulates the unlock data into an unlock signal, and wirelessly transmits the unlock signal 403 (see FIG. 6) using the RF transmission antenna 24. The wireless transmission of the unlock signal is completed at time t17.

  Subsequently, the process proceeds to step 365, and after receiving the unlock signal 403 in step 360, it is determined whether or not the portable device 20 has received a cancel release signal. Specifically, it is determined whether or not cancel cancellation data is acquired from the LF demodulator 22 after time t17. If it is determined that the cancel cancellation signal has not been received by the portable device 20, the process proceeds to step 370, and whether or not a predetermined time D4 (for example, 100 milliseconds) has elapsed since time t16 when the unlock operation 401 was performed. If it is determined that it has not elapsed, the process returns to step 365.

  In this example, since the in-vehicle system 10 has not yet wirelessly transmitted the cancellation cancellation signal, the process of steps 365 and 370 is repeated to wait for the reception of the cancellation cancellation signal or the elapse of time D4.

  On the other hand, in the in-vehicle system 10, the RF reception antenna 4 receives the unlock signal 407 wirelessly transmitted as described above, the RF demodulation unit 5 demodulates, and the unlock data of the demodulation result is output to the smart ECU 1. .

  Then, the smart ECU 1 determines that the unlock signal has been received in step 250, proceeds to step 255, and determines whether or not it is immediately after the cancel cancellation operation. The cancellation cancellation here is a predetermined operation on the operation unit 8 of the in-vehicle system 10. Whether or not it is immediately after the cancellation operation is performed is determined, for example, by whether or not the time from the cancellation operation to the current time is within a predetermined time (for example, 1 minute).

  In this example, since the user is outside the vehicle and the cancel release operation is not performed on the operation unit 8, it is determined that the cancel release operation has not been performed, and the process proceeds to step 260. In step 260, the actuator 7 is controlled to unlock the vehicle door (see step 407 in FIG. 6), and the process returns to step 250. Thus, when it is not immediately after cancellation cancellation operation was performed with respect to the vehicle-mounted system 10, the unlock signal 401 is transmitted from the portable device 20 to the vehicle-mounted system 10 by performing the unlocking operation 401 with respect to the portable device 20. Wireless transmission is performed, and the in-vehicle system 10 unlocks the door of the vehicle based on the reception of the unlock signal 403.

  On the other hand, since the time D4 has elapsed in steps 365 and 370 without receiving the cancel cancellation signal, the portable device 20 determines that the time D4 has elapsed in step 370 at the time t18, and the processing is performed in step 375. Proceed to

  In step 375, the process proceeds to the low power consumption mode in the same process as step 325 in FIG. 5 and the process returns to step 350. As a result, as shown in FIG. 7, the mobile device 20 shifts to the low power consumption mode at time t18 (see step 405 in FIG. 6). To maintain.

  In the low power consumption mode, as already described, the power consumption of the portable control unit 26 is lower than that in the normal power consumption mode, and the LF demodulator 22 does not supply power to the amplifier circuit and the local oscillator. , Power consumption is reduced, and wireless signals cannot be received.

  Thereafter, it is assumed that the user carries the portable device 20 and enters the vehicle, and performs a predetermined cancel cancellation operation 409 on the operation unit 8 of the in-vehicle system 10 at time t19. Thereby, the smart ECU 1 can perform wireless transmission by the LF modulation unit 3 by transitioning from the low power consumption mode to the normal power consumption mode (step 410).

  At time t20 after several seconds, the user performs a cancel cancellation operation 411 on the operation unit 23 of the portable device 20. Specifically, the cancel cancellation operation 411 is pressing of the unlock button 23b. Therefore, in this embodiment, the cancel cancellation operation and the unlock operation have the same operation content.

  Then, the portable control unit 26 determines in step 350 that a predetermined unlock operation has been performed, proceeds to step 355, and performs the activation process as already described. Thereby, the LF demodulator 22 can receive a radio signal, and the RF modulator 25 can transmit a radio signal.

  Subsequently, in step 360, as already described, processing for transmitting the unlock signal is executed. As a result, the RF modulation unit 25 modulates the unlock data into an unlock signal, and wirelessly transmits the unlock signal 413 (see FIG. 6) using the RF transmission antenna 24. The wireless transmission of the unlock signal is completed at time t21. Subsequently, in steps 365 and 370, as described above, the reception of the cancel release signal or the elapse of time D4 (starting from the time point t20 when the unlocking operation 411 is performed) is waited for. The unlock signal 413 corresponds to an example of a signal corresponding to the first cancel cancellation operation.

  On the other hand, in the in-vehicle system 10, the unlock signal 413 wirelessly transmitted as described above is received by the RF receiving antenna 4, the RF demodulator 5 demodulates, and the unlock data of the demodulation result is output to the smart ECU 1. .

  Then, the smart ECU 1 determines that the unlock signal has been received in step 250, proceeds to step 255, and determines whether or not it is immediately after the cancel cancellation operation. The cancellation cancellation here is a predetermined operation on the operation unit 8 of the in-vehicle system 10. In this example, since the time from the cancel cancel operation to the current time is about several seconds and is within the above-mentioned predetermined time, it is determined that the cancel cancel operation has just been performed, and the process proceeds to step 265.

  In step 265, processing for transmitting a cancel cancellation signal is performed. Specifically, predetermined cancellation cancellation data is output to the LF modulation unit 3. As a result, the LF modulation unit 3 modulates the cancellation cancellation data, and transmits the cancellation cancellation signal 415, which is the LF waveband signal as a result of the modulation, using the LF transmission antenna 2. After step 265, processing returns to step 250. At the same time, the smart ECU 1 restarts the process of FIG.

  The time point t22 at which the cancel cancellation signal 415 is transmitted in this way is a time point when the time D5 has elapsed from the time point t20, but this time D1 is shorter than D4 as a determination criterion in step 370 of FIG. That is, the time D4 is set in advance so as to be longer than the time D1 when the portable device 20 transmits the unlock signal and receives the cancel release signal after the unlock operation is performed in the portable device 20.

  On the other hand, in the portable device 20, the cancellation cancellation signal 415 is received by the LF reception antenna 21, the LF demodulation unit 22 demodulates, and the cancellation cancellation data of the demodulation result is output to the portable side control unit 26. At this time t22, the smart ECU 1 does not determine that the time D4 has elapsed in step 370 as described above, so the steps 365 and 370 are repeated, and in step 365 immediately after the cancellation cancellation data is acquired, It is determined that a cancel cancellation signal has been received, and the process proceeds to step 380. In step 380, the process transitions to the normal power consumption mode (see step 417 in FIG. 6) and the process in FIG. 5 is resumed.

  As a result, the portable device 20 thereafter repeats the low power consumption mode at time D2 and the normal power consumption mode at time D1 while waiting for reception of the request signal at step 305 in FIG. Therefore, the request signal can be received as usual.

  As described above, when the predetermined cancel operation 117 is performed on the in-vehicle system 10 of the smart system, the portable device 20 stops the alternate repetition of the normal power consumption mode and the low power consumption mode to reduce the power consumption. Maintain power mode. In this way, when the smart system stops the smart function, the alternating repetition of the normal power consumption mode and the low power consumption mode can be stopped. Can also be reduced.

  Further, based on a predetermined cancel operation 117 being performed on the in-vehicle system 10, the smart function stop signal 123 is transmitted from the in-vehicle system 10 to the portable device 20, and the portable device 20 transmits the smart function stop signal 123. Based on the reception, the alternating repetition of the normal power consumption mode and the low power consumption mode is stopped and the low power consumption mode is maintained. In this way, when the smart function is stopped, the alternate repetition of the normal power consumption mode and the low power consumption mode can be stopped, so that the power consumption of the portable device is reduced as compared with the conventional case. be able to.

  The in-vehicle system 10 wirelessly transmits the second request signal 119 based on the reception of the smart function stop signal 123 and receives the second answer signal 121 corresponding to the second request signal. Since the smart function stop signal 123 is transmitted to the portable device 20 based on the above, the smart function stop signal 123 can be transmitted in a situation where the portable device 20 is reliably within the communication range of the in-vehicle system 10.

  The in-vehicle system 10 transmits the smart function stop signal 123 to the portable device 20 based on the reception of the second answer signal 121, and then transitions to a low power consumption mode in which the signal cannot be wirelessly transmitted. As a result, the in-vehicle system 10 transmits the smart function stop signal 123 to the low power consumption mode in which the signal cannot be transmitted wirelessly even though the portable device 20 is not within the communication range of the in-vehicle system 10. It is possible to prevent transition.

  Further, based on the fact that a predetermined cancellation cancellation operation 411 (corresponding to an example of the first cancellation cancellation operation) is performed on the portable device 20, the portable device (20) is in the normal power consumption mode and the low power consumption. By restarting the alternate repetition of the mode, the portable device (20) can receive a radio signal.

  In addition, when a predetermined cancel cancellation operation 411 is performed on the portable device 20, first, the demodulation unit 22 is allowed to receive a signal, and the predetermined cancellation cancellation operation 409 (second canceling operation) is performed on the in-vehicle system 10. By resuming the alternating repetition of the normal power consumption mode and the low power consumption mode based on the fact that the cancel cancellation signal 415 wirelessly transmitted from the in-vehicle system 10 is received. If the in-vehicle system 10 is not operated, the portable device 20 can be prevented from returning alternately between the normal power consumption mode and the low power consumption mode. Therefore, the cancel cancellation operation 409 is erroneously performed on the portable device 20. It is possible to prevent the alternate repetition of the normal power consumption mode and the low power consumption mode from being resumed.

  Further, the alternate repetition of the normal power consumption mode and the low power consumption mode is resumed on the condition that the cancellation cancellation signal 415 is received within the predetermined time D4 after the cancellation cancellation operation 409 is performed on the portable device 20. Thus, there is a possibility that a signal that arrives at the cancellation cancellation signal is received from another device different from the in-vehicle system 10, and as a result, the alternate repetition of the normal power consumption mode and the low power consumption mode may be erroneously resumed. Reduced.

(Other embodiments)
As mentioned above, although embodiment of this invention was described, the scope of the present invention is not limited only to the said embodiment, The various form which can implement | achieve the function of each invention specific matter of this invention is included. It is. For example, the following forms are also acceptable.

  (1) In the above embodiment, the cancel operation 117 (see FIG. 3) and the cancel release operation 409 (see FIG. 6, corresponding to an example of the second cancel release operation) for the in-vehicle system 10 are respectively performed on the operation unit 8. An operation (for example, pressing a dedicated button). By doing in this way, the user of the vehicle can easily perform the cancel operation 117 and the cancel release operation 409 in accordance with Japan-U.

  However, the cancel operation and the second cancel release operation for the in-vehicle system 10 according to the present invention are not necessarily limited to this. For example, the operation of removing the fuse 31 shown in FIG. 1 is referred to as a cancel operation 117, and the operation of returning the fuse 31 (for example, in the fuse box of the engine room) to the original state (returning to the state of FIG. 1) is the second operation. It is good also as cancellation cancellation operation 409.

  In this case, in step 210 of FIG. 4, the smart ECU 1 determines whether or not the fuse 31 has been removed, and in step 410 of FIG. Just go back. Note that the operation of removing the fuse 31 is performed, for example, when the vehicle is transported by ship to bring the vehicle into a transport mode.

  (2) Moreover, in the said embodiment, pressing down (unlock operation) of the unlock button 23b is illustrated as 1st cancellation cancellation | release operation. However, the first cancel release operation is not limited to the unlock operation, and may be realized by other operations. For example, the pressing operation (locking operation) of the lock button 23a may be the first cancel canceling operation, and the dedicated operation (for example, pressing the cancel canceling dedicated button) is the first cancel canceling operation. May be.

  (3) In the above embodiment, the portable device 20 maintains the low power consumption mode through the procedure as shown in FIG. 3 (step 127). Also good. For example, when a predetermined cancel operation (for example, simultaneous pressing operation of the lock button 23a and the unlock button 23b) is performed on the portable device 20, the alternating repetition of the normal power consumption mode and the low power consumption mode is immediately stopped. The low power consumption mode may be maintained.

  (4) In the above embodiment, the portable device 20 resumes alternating repetition of the normal power consumption mode and the low power consumption mode through the procedure as shown in FIG. 6 (step 417). It is not necessary to follow such a procedure. When a predetermined first cancel cancellation operation (for example, simultaneous pressing operation of the lock button 23a and the unlock button 23b) is performed on the portable device 20, the normal power consumption mode and the low power consumption mode are immediately repeated alternately. You may come to do.

  (5) In the above embodiment, the unlock signal 413 (the same signal as the unlock signal 403) for unlocking the vehicle door is an example of a signal corresponding to the first cancel cancellation operation. However, the signal corresponding to the first cancel release operation is not necessarily an unlock signal, and is a dedicated signal corresponding to the first cancel release operation (a signal different from the unlock signal 403). Also good.

  (6) In the above embodiment, the request signal 119 (corresponding to an example of the second request signal) and the answer signal 121 (corresponding to an example of the second answer signal) ) And the answer signal 113 (corresponding to an example of the first answer signal), but it does not necessarily have to be so.

1 Smart ECU
3 LF modulation unit 5 RF demodulation unit 8 operation unit 10 in-vehicle system 20 portable device 22 LF demodulation unit 23 operation unit 23a lock button 23b unlock button 26 portable side control unit

Claims (3)

An in-vehicle system (10) mounted on a vehicle and a portable device (20) portable by a user, the in-vehicle system (10) wirelessly transmits a first request signal (111), and the portable device ( 20) wirelessly transmits a first answer signal (113) based on the reception of the first request signal (111), and the in-vehicle system (10) wirelessly transmits the first answer signal (113). A smart system that performs one or both of unlocking the door of the vehicle and starting the vehicle drive unit based on the received information;
The portable device (20), which has a demodulation unit for amplifying and demodulating received radio transmitted signal (22), receiving the signal the demodulation unit (22) from the vehicle mounting system (10) A normal power consumption mode that is possible and a low power consumption mode in which the demodulator (22) cannot receive a signal and consumes less power than the normal power consumption mode are alternately repeated,
The vehicle system (10), based on the predetermined cancel operation (117) is performed on the wheel mounting system (10), a second request signal (119) to the portable machine (20) Send
The portable device (20) wirelessly transmits a second answer signal (121) based on receiving the second request signal (119),
The in-vehicle system (10) transmits a smart function stop signal (123) to the portable device (20) based on the reception of the second answer signal (121) ,
Based on the reception of the smart function stop signal (123), the portable device (20) stops the alternate repetition of the normal power consumption mode and the low power consumption mode and maintains the low power consumption mode. A smart system characterized by that. The in-vehicle system (10) transmits the smart function stop signal (123) to the portable device (20) based on the reception of the second answer signal (121), and then wirelessly transmits the signal. smart system according to claim 1, characterized in that wherein the transition to the low power consumption mode which can not be. An in-vehicle system (10) mounted on a vehicle and a portable device (20) portable by a user, the in-vehicle system (10) wirelessly transmits a first request signal (111), and the portable device ( 20) wirelessly transmits a first answer signal (113) based on the reception of the first request signal (111), and the in-vehicle system (10) wirelessly transmits the first answer signal (113). A smart system that performs one or both of unlocking the door of the vehicle and starting the vehicle drive unit based on the received information;
The portable device (20), which has a demodulation unit for amplifying and demodulating received radio transmitted signal (22), receiving the signal the demodulation unit (22) from the vehicle mounting system (10) A possible normal power consumption mode and a low power consumption mode in which the demodulator (22) cannot receive a signal and consumes less power than the normal power consumption mode are alternately repeated, and for the smart system Based on the fact that a predetermined cancel operation has been performed, stop the alternate repetition of the normal power consumption mode and the low power consumption mode to maintain the low power consumption mode,
Based on the fact that a predetermined first cancel cancellation operation (411) is performed on the portable device (20) when the portable device (20) maintains the low power consumption mode, The portable device (20) resumes alternating repetition of the normal power consumption mode and the low power consumption mode ,
Based on the fact that the first cancel cancellation operation (411) is performed on the portable device (20) when the portable device (20) maintains the low power consumption mode, The machine (20) enables the demodulation unit (22) to receive a signal and wirelessly transmits a signal (413) according to the first cancel cancellation operation,
The in-vehicle system (10) performs the signal (in response to the first cancel cancellation operation (411)) after a predetermined second cancellation cancellation operation (409) is performed on the in-vehicle system (10). 413) is received, the cancel cancellation signal (415) is wirelessly transmitted,
The portable device (20) has the demodulator (22) connected to the portable device (20) before the predetermined time (D4) elapses after the first cancel cancellation operation (411) is performed. A smart system which resumes the alternating repetition of the normal power consumption mode and the low power consumption mode based on the reception of the cancel cancellation signal (415) .

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